Home / 7,129.26-9,838.41-3,942.78

Finding the Fourth Proportional to 7,129.26, 9,838.41 and 3,942.78

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Solution

The fourth proportional to 7,129.26, 9,838.41 and 3,942.78 is: 5,441.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,129.26 : 9,838.41 = 3,942.78 : x
  2. Step 2: Convert to fraction form
    7,129.26/9,838.41 = 3,942.78/x
  3. Step 3: Cross multiply
    7,129.26x = 9,838.41 × 3,942.78
  4. Step 4: Simplify right side
    7,129.26x = 38,790,686.18
  5. Step 5: Solve for x
    x = 38,790,686.18/7,129.26
  6. Step 6: Final answer
    x = 5,441.05

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.